I had the privilege of shadowing the hon. Gentleman when he was a Minister with responsibility for technology, and saw his rigorous approach to scientific and technological matters. I am delighted that he continues to take that approach in the same independent manner. We should improve not only the operation of the airport but people's access, which is one of the conditions that we set out in 2003. I have set out a number of proposals that will undoubtedly improve access. In answer to his question, however, it is often overlooked that running diesel engines at high speed is carbon-inefficient, whereas running electrified engines at high speed, particularly on the basis of the changes proposed to ensure that more renewable electricity energy is generated, will make a real difference to the carbon impact of our transport network.
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